Removal & Installation
9.75 Inch Ring Gear
Before servicing the vehicle, refer to the precautions section.
NOTEIf equipped, turn the air suspension switch to the OFF position.
NOTEThe rear wheels and brake calipers must be removed to prevent brake drag during drive pinion bearing preload adjustment.
- With the vehicle in NEUTRAL, position the vehicle on a hoist.
- Remove the rear wheel and tire assemblies.
- Remove the rear brake calipers and the brake discs.
- Remove the rear driveshaft assembly.
Install a Nm (lb-in) torque wrench on the nut and record the torque necessary to maintain rotation of the drive pinion gear through several revolutions
WARNINGAfter removing the pinion nut, discard it. Use a new nut for installation.
- Use the special tool to hold the pinion flange while removing the pinion nut.
- Index-mark the drive pinion flange and the drive pinion gear stem to maintain initial balance during installation.
Using the special tool 205-D072, remove the drive pinion flange.
- Force up on the metal flange of the drive pinion seal. Install gripping pliers and strike with a hammer until the pinion seal is removed.
- Lubricate the lips of the new drive pinion seal with grease.
- Using the special tool 205-208, install the drive pinion seal.
- Lubricate the drive pinion flange splines with rear axle lubricant
- Position the drive pinion flange.
Using the special tool 205-233, install the drive pinion flange.
Position the new drive pinion nut
WARNINGDo not under any circumstance loosen the nut to reduce preload. If it is necessary to reduce preload, install a new drive pinion collapsible spacer and nut.
Use the special tool 205-126 to hold the pinion flange while tightening the nut.
NOTEInstall the driveshaft with new bolts. If new bolts are not available, apply sealer to the threads of the original bolts.
Rotate the pinion occasionally to make sure the pinion bearings seat correctly. Take frequent pinion bearing torque preload readings by rotating the drive pinion gear with a Nm (lb-in) torque wrench
Align the index marks.
NOTEThe driveshaft flange yoke fits tightly on the pinion flange pilot. To make sure that the yoke seats squarely on the flange, tighten the bolts evenly in a cross pattern as shown.
- Install the rear driveshaft.
- Install the rear brake discs and the brake calipers.
- Check fluid level and add if needed.
- Install the rear wheel and tire assemblies.
- Lower the vehicle.
- If equipped with air suspension, reactivate the system.